Honeywell VR8305Q4500 Gas Valve

The Honeywell VR8305Q4500 is an industrial-grade two-stage gas valve engineered for precision in high-capacity 24Vac heating systems. This 3/4" x 3/4" direct ignition valve is purpose-built for use with hot surface or direct spark ignition (HSI/DSI) configurations and is the factory-authorized direct replacement for S1-025-35303-000. It features a straight-through body pattern with an adjustable servo regulator to maintain consistent manifold pressure, factory-set at 1.7" w.c. for low fire and 3.5" w.c. for high fire. With a robust BTU capacity range of 30,000 to 415,000 BTUh, this combination gas control ensures reliable performance across diverse gas-fired appliances. The standard opening characteristic provides traditional ignition timing, while the dual automatic solenoid operators meet strict safety codes for fuel shut-off. This kit includes a natural gas to LP conversion kit and 3/4" x 1/2" reducer bushings, providing the versatility needed for field modifications and varying pipe sizes.

• Dual Automatic Operators: Provides redundant safety shut-off to meet modern HVAC safety codes and prevents gas leakage during power interruptions.
• Servo Regulator Support: Effectively stabilizes output pressure despite fluctuating inlet supply, ensuring stable combustion in low and high fire stages.
• Extended Temperature Rating: Built for professional environments with an operating range of -40°F to +175°F for consistent performance in unconditioned spaces.
• Complete Field Kit: Simplifies installation with included reducer bushings and a 393691 LP conversion kit for switching between fuel types on-site.

Is the VR8305Q4500 compatible with intermittent pilot systems?
No, this model is specifically designed for direct ignition systems (HSI or DSI). For intermittent pilot applications, verify the module requirements before installation.

Can this valve be mounted in any orientation?
The valve is rated for mounting between 0 and 90 degrees from the upright position, including vertical mounting, allowing for flexibility in tight cabinet footprints.

How do I check the manifold pressure on this unit?
This Honeywell gas valve includes standard 1/8" NPT inlet and outlet pressure taps with plugs, accessible from the top of the control for easy manometer connection.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.